I understood that it was a Suva (insurance company) initative to try and convince us that we should be skiing slower than 30kph. They are said to be clocking skiiers at Andermatt with hand held radar guns. According to Ski-mag.com, the radar patrol will be soon expanding to St. Moritz, Zermatt & Davos as well. I was at Arosa recently & there wasn't anything similar. So long as it is only advisory, it seems harmless enough. The problem though is that those advisory things have a habit of morphing into hard restrictions, fines & prohibitions.

http://www.ski-mag.com/en/ski/clanak.php?id=18288